CVE-2021-47814Public exploit

Application crash via registration-field buffer overflow

Published Jan 15, 2026 · Updated Jan 15, 2026

Buffer overflow in Nsasoft NBMonitor Network Bandwidth Monitor 1.6.8 allows local users to crash the application via a crafted registration key. The registration dialog copies a pasted 256-character key into a fixed-size buffer without checking the destination length. Exploitation requires local interaction with the desktop dialog, and the documented consequence is termination of the NBMonitor process.

CVSS severity6.7
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Nsasoft NBMonitor Network Bandwidth Monitor 1.6.8 allows local users to crash the application via a crafted registration key. The registration dialog copies a pasted 256-character key into a fixed-size buffer without checking the destination length. Exploitation requires local interaction with the desktop dialog, and the documented consequence is termination of the NBMonitor process.

The record

CVE
CVE-2021-47814
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Nsasoft
Product
NBMonitor Network Bandwidth Monitor
Classifications
CWE-120
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.6.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Nsasoft · NBMonitor Network Bandwidth Monitorversion=1.6.8

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.7VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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